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Increase perf of handling presence when joining large rooms. (#9916)

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Erik Johnston 2021-05-05 17:27:05 +01:00 committed by GitHub
parent e2a443550e
commit 37623e3382
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3 changed files with 84 additions and 79 deletions
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1
changelog.d/9916.feature Normal file
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@ -0,0 +1 @@
Improve performance after joining a large room when presence is enabled.

150
synapse/handlers/presence.py
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@ -1183,7 +1183,16 @@ class PresenceHandler(BasePresenceHandler):
max_pos, deltas = await self.store.get_current_state_deltas(
self._event_pos, room_max_stream_ordering
)
await self._handle_state_delta(deltas)
# We may get multiple deltas for different rooms, but we want to
# handle them on a room by room basis, so we batch them up by
# room.
deltas_by_room: Dict[str, List[JsonDict]] = {}
for delta in deltas:
deltas_by_room.setdefault(delta["room_id"], []).append(delta)
for room_id, deltas_for_room in deltas_by_room.items():
await self._handle_state_delta(room_id, deltas_for_room)
self._event_pos = max_pos
@ -1192,17 +1201,21 @@ class PresenceHandler(BasePresenceHandler):
max_pos
)
async def _handle_state_delta(self, deltas: List[JsonDict]) -> None:
"""Process current state deltas to find new joins that need to be
handled.
async def _handle_state_delta(self, room_id: str, deltas: List[JsonDict]) -> None:
"""Process current state deltas for the room to find new joins that need
to be handled.
"""
# A map of destination to a set of user state that they should receive
presence_destinations = {} # type: Dict[str, Set[UserPresenceState]]
# Sets of newly joined users. Note that if the local server is
# joining a remote room for the first time we'll see both the joining
# user and all remote users as newly joined.
newly_joined_users = set()
for delta in deltas:
assert room_id == delta["room_id"]
typ = delta["type"]
state_key = delta["state_key"]
room_id = delta["room_id"]
event_id = delta["event_id"]
prev_event_id = delta["prev_event_id"]
@ -1231,72 +1244,55 @@ class PresenceHandler(BasePresenceHandler):
# Ignore changes to join events.
continue
# Retrieve any user presence state updates that need to be sent as a result,
# and the destinations that need to receive it
destinations, user_presence_states = await self._on_user_joined_room(
room_id, state_key
)
newly_joined_users.add(state_key)
# Insert the destinations and respective updates into our destinations dict
for destination in destinations:
presence_destinations.setdefault(destination, set()).update(
user_presence_states
)
if not newly_joined_users:
# If nobody has joined then there's nothing to do.
return
# Send out user presence updates for each destination
for destination, user_state_set in presence_destinations.items():
self._federation_queue.send_presence_to_destinations(
destinations=[destination], states=user_state_set
)
async def _on_user_joined_room(
self, room_id: str, user_id: str
) -> Tuple[List[str], List[UserPresenceState]]:
"""Called when we detect a user joining the room via the current state
delta stream. Returns the destinations that need to be updated and the
presence updates to send to them.
Args:
room_id: The ID of the room that the user has joined.
user_id: The ID of the user that has joined the room.
Returns:
A tuple of destinations and presence updates to send to them.
"""
if self.is_mine_id(user_id):
# If this is a local user then we need to send their presence
# out to hosts in the room (who don't already have it)
# TODO: We should be able to filter the hosts down to those that
# haven't previously seen the user
remote_hosts = await self.state.get_current_hosts_in_room(room_id)
# Filter out ourselves.
filtered_remote_hosts = [
host for host in remote_hosts if host != self.server_name
]
state = await self.current_state_for_user(user_id)
return filtered_remote_hosts, [state]
else:
# A remote user has joined the room, so we need to:
# 1. Check if this is a new server in the room
# 2. If so send any presence they don't already have for
# local users in the room.
# TODO: We should be able to filter the users down to those that
# the server hasn't previously seen
# TODO: Check that this is actually a new server joining the
# room.
remote_host = get_domain_from_id(user_id)
# We want to send:
# 1. presence states of all local users in the room to newly joined
# remote servers
# 2. presence states of newly joined users to all remote servers in
# the room.
#
# TODO: Only send presence states to remote hosts that don't already
# have them (because they already share rooms).
# Get all the users who were already in the room, by fetching the
# current users in the room and removing the newly joined users.
users = await self.store.get_users_in_room(room_id)
user_ids = list(filter(self.is_mine_id, users))
prev_users = set(users) - newly_joined_users
states_d = await self.current_state_for_users(user_ids)
# Construct sets for all the local users and remote hosts that were
# already in the room
prev_local_users = []
prev_remote_hosts = set()
for user_id in prev_users:
if self.is_mine_id(user_id):
prev_local_users.append(user_id)
else:
prev_remote_hosts.add(get_domain_from_id(user_id))
# Similarly, construct sets for all the local users and remote hosts
# that were *not* already in the room. Care needs to be taken with the
# calculating the remote hosts, as a host may have already been in the
# room even if there is a newly joined user from that host.
newly_joined_local_users = []
newly_joined_remote_hosts = set()
for user_id in newly_joined_users:
if self.is_mine_id(user_id):
newly_joined_local_users.append(user_id)
else:
host = get_domain_from_id(user_id)
if host not in prev_remote_hosts:
newly_joined_remote_hosts.add(host)
# Send presence states of all local users in the room to newly joined
# remote servers. (We actually only send states for local users already
# in the room, as we'll send states for newly joined local users below.)
if prev_local_users and newly_joined_remote_hosts:
local_states = await self.current_state_for_users(prev_local_users)
# Filter out old presence, i.e. offline presence states where
# the user hasn't been active for a week. We can change this
@ -1306,13 +1302,27 @@ class PresenceHandler(BasePresenceHandler):
now = self.clock.time_msec()
states = [
state
for state in states_d.values()
for state in local_states.values()
if state.state != PresenceState.OFFLINE
or now - state.last_active_ts < 7 * 24 * 60 * 60 * 1000
or state.status_msg is not None
]
return [remote_host], states
self._federation_queue.send_presence_to_destinations(
destinations=newly_joined_remote_hosts,
states=states,
)
# Send presence states of newly joined users to all remote servers in
# the room
if newly_joined_local_users and (
prev_remote_hosts or newly_joined_remote_hosts
):
local_states = await self.current_state_for_users(newly_joined_local_users)
self._federation_queue.send_presence_to_destinations(
destinations=prev_remote_hosts | newly_joined_remote_hosts,
states=list(local_states.values()),
)
def should_notify(old_state: UserPresenceState, new_state: UserPresenceState) -> bool:

14
tests/handlers/test_presence.py
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@ -729,7 +729,7 @@ class PresenceJoinTestCase(unittest.HomeserverTestCase):
)
self.assertEqual(expected_state.state, PresenceState.ONLINE)
self.federation_sender.send_presence_to_destinations.assert_called_once_with(
destinations=["server2"], states={expected_state}
destinations={"server2"}, states=[expected_state]
)
#
@ -740,7 +740,7 @@ class PresenceJoinTestCase(unittest.HomeserverTestCase):
self._add_new_user(room_id, "@bob:server3")
self.federation_sender.send_presence_to_destinations.assert_called_once_with(
destinations=["server3"], states={expected_state}
destinations={"server3"}, states=[expected_state]
)
def test_remote_gets_presence_when_local_user_joins(self):
@ -788,14 +788,8 @@ class PresenceJoinTestCase(unittest.HomeserverTestCase):
self.presence_handler.current_state_for_user("@test2:server")
)
self.assertEqual(expected_state.state, PresenceState.ONLINE)
self.assertEqual(
self.federation_sender.send_presence_to_destinations.call_count, 2
)
self.federation_sender.send_presence_to_destinations.assert_any_call(
destinations=["server3"], states={expected_state}
)
self.federation_sender.send_presence_to_destinations.assert_any_call(
destinations=["server2"], states={expected_state}
self.federation_sender.send_presence_to_destinations.assert_called_once_with(
destinations={"server2", "server3"}, states=[expected_state]
)
def _add_new_user(self, room_id, user_id):